Abstract
The environmental conditions during the past 7000 cal yr BP in the Okhotsk Sea can be subdivided into three intervals based on diatom assemblages: (1) 6600–4650 cal yr BP open-ocean sea-ice free conditions alternated with sea-ice cover, (2) 4650–1300 cal yr BP open-ocean conditions and sea-ice cover declined, fluctuating with short duration, and cold open-ocean conditions gradually developed, and (3) 1300 cal yr BP–Present when cold open-ocean conditions predominated with occasional and rapid warming. Chronological comparisons between climatic fluctuations and cultural history in Hokkaido and Okhotsk suggest that deteriorating climate could have affected local culture.
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